Hybrid excitation type of a permanent magnet - synchronous motor

摘要

A hybrid excitation type permanent magnet synchronous motor is provided with an armature (1) and a rotor core (12) arranged to be rotated relative to the armature (1). Permanent magnets are installed to the rotor core (12) and generates magnetic flux which passes through the armature (1) through a gap between the rotor and armature. Salient pole portions are integral with the rotor core and not covered with the permanent magnets. The salient pole portions (12a) are arranged opposite to the armature (1) through gap such that the magnetic flux by the permanent magnets is effected by the magnetic flux passing through the salient pole portions. A direct current excitation coil (5) generates the magnetic flux passing through the salient pole portions (12a). Therefore, an operable speed area of the motor is increased without using the demagnetization control and without degrading the efficiency. Also a damper coil (17, see fig. 13) may be installed to the salient pole portions (12a). Another embodiment (see fig. 26) comprises a rotor with permanet magnets (13) attached on the whole surface of the rotor. The different poles and salient pole portions interlock (see fig. 28). A further embodiment (see fig. 33) is made like a pancake.